Re: [CAD_CAM_EDM_DRO] Re: CNC Machine for relatively precise wood carving-what would I need?

You may want to take a look at my web page www.campbelldesigns.com

My design would be great for what you want to do. I am currently teaching a
class for wood carvers every Wednesday night. We are using Rhino3D for the
designs and VisualMill for the Cam. A small moving table design would be
what you are looking for. It would give you the rigidity and precision that
you are looking for.

Bob Campbell

----- Original Message -----
From: <info@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, March 04, 2003 1:39 PM
Subject: [CAD_CAM_EDM_DRO] Re: CNC Machine for relatively precise wood
carving-what would I need?


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "wyatt_meng <wyattmeng@h...>"
> <wyattmeng@h...> wrote:
> > Hi,
> >
> > First of all, let me say that I'm relatively new to this.
> >
> > I'm trying to build a machine for wood carving. It would have to be
> > able to cut with enough precision to cut an approximate 1mm groove.
> > It would also have to be able to cut 3-dimensionally. What would I
> > need? What would it cost? What would I need in terms of computer
> > controls? Price isn't much of a problem, so I'm open to any
> > suggestions. The work area would have to be about 22" x 16" x 1".
> >
> > Thanks for your time.
>
> Wyatt. There are more qualified persons on the list that can give
> you advice about 3D carving in wood. It sounds however that what you
> want to do is more 2.5D; that you want to route designs into flat
> wood pieces. I gathered that from your 1" Z specification. Have you
> looked at any software design programs? Is your intent more artistic
> (signs, plaques, etc) or mechanical (furniture parts, mold masters,
> etc). For TRUE 3D you need to be considering a 4 or 5 axis machine.
> By telling us what your intended end result is we can give more
> concise advice.
>
> The issue with accuracy has a lot to do with cumulative error and
> repeatability rather than just raw resolution. You can easily build
> a machine that has a resolution of .0001 inch or better but has so
> much backlash and flex that it's lucky to hold .1 inch (or worse).
> Remember that complex wood carving/routing can consist of thousands
> of lines (moves) in g-code and a machine with bad backlash and
> excessive flex will give really poor results. I just finished a
> carving (.65 inch deep in 1" wood) that was 60,000 lines of code. It
> took 4 hours to run on the machine and it only went back to 0,0 three
> times in the whole thing!
>
> I know this did not answer your question, but until we understand
> your end usage any advice is pure speculation.
>
> I responded because I saw no one else did and it's important that new
> members questions get answered. Contact me off list if you want and
> I will take the time to relate my experiences in building and
> programming 3 different hobby CNC machines.
>
>
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